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Module 5: Adding Code to a Microsoft ASP.NET Web Form

Overview ,[object Object],[object Object],[object Object]

Lesson: Using Code-Behind Pages ,[object Object],[object Object],[object Object],[object Object]

How to Implement Code ,[object Object],[object Object],[object Object],[object Object],[object Object]

Writing Inline Code ,[object Object],[object Object],<HTML> <asp:Button id="btn" runat="server"/> </HTML> <SCRIPT Language="vb" runat="server"> Sub btn_Click(s As Object, e As EventArgs) Handles btn.Click ... End Sub </SCRIPT> <HTML> <asp:Button id="btn" runat="server"/> </HTML> <SCRIPT Language="c#" runat="server"> private void btn_Click(object sender, System.EventArgs e) { . . . } </SCRIPT>

What are Code-Behind Pages? ,[object Object],[object Object],Form1.aspx Form1.aspx Form1.aspx.vb or Form1.aspx.cs <tags> <tags> code code Separate files Single file

Understanding How Code-Behind Pages Work ,[object Object],[object Object],[object Object],Page1.aspx <% @ Page Language="c#" Inherits="Project.WebForm1" Codebehind="Page1.aspx.cs" Src = "Page1.aspx.cs" %> Page1.aspx.cs public class WebForm1 { private void cmd1_Click() { … } }

Lesson: Adding Event Procedures to Web Server Controls ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What are Event Procedures? ,[object Object]

Demonstration: Using Events ,[object Object],[object Object],[object Object],[object Object]

Client-Side Event Procedures Internet .HTM Pages ,[object Object],[object Object],[object Object],[object Object]

Server-Side Event Procedures ,[object Object],[object Object],[object Object],[object Object],Internet .ASPX Pages

Multimedia: Client-Side and Server-Side Events

Creating Event Procedures ,[object Object],[object Object],protected System.Web.UI.WebControls.Button cmd1; private void InitializeComponent() { this.cmd1.Click += new System.EventHandler(this.cmd1_Click); this.Load += new System.EventHandler(this.Page_Load); } private void cmd1_Click(object s, System.EventArgs e) Protected WithEvents cmd1 As System.Web.UI.WebControls.Button Private Sub cmd1_Click(ByVal s As System.Object, _ ByVal e As System.EventArgs) Handles cmd1.Click

Instructor-Led Practice: Creating an Event Procedure ,[object Object],[object Object],[object Object],[object Object]

Interacting with Controls in Event Procedures ,[object Object],[object Object],lblGreeting.Text = "new text" strGreeting = "Hello " & txtName.Text strGreeting = "Hello " + txtName.Text; lblGreeting.Text = "new text";

Lesson: Using Page Events ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Understanding the Page Event Life Cycle ,[object Object],Page_Load Page_Unload Textbox1_Changed Button1_Click Page_Init Control events Change Events Action Events

Multimedia: The Postback Process

Demonstration: Handling Events

Practice: Placing Events in Order ,[object Object],[object Object],[object Object]

Handling Page.IsPostback Events ,[object Object],[object Object],[object Object],Private Sub Page_Load(ByVal s As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load If Not Page.IsPostBack Then 'executes only on initial page load End If 'this code executes on every request End Sub private void Page_Load(object sender, System.EventArgs e) { if (!Page.IsPostBack) { // executes only on initial page load } //this code executes on every request }

Linking Two Controls Together ,[object Object],[object Object],<asp:DropDownList id="lstOccupation" autoPostBack="True" runat="server" > You selected: <asp:Label id="lblSelectedValue" Text=" <%# lstOccupation.SelectedItem.Text %> " runat="server" /> private void Page_Load(object sender, System.EventArgs e) { lblSelectedValue.DataBind(); } Sub Page_Load(s As Object, e As EventArgs) Handles MyBase.Load lblSelectedValue.DataBind() End Sub

Demonstration: Linking Controls Together ,[object Object]

Review ,[object Object],[object Object],[object Object]

Lab 5: Adding Functionality to a Web Application Medical Medical.aspx Benefits Home Page Default.aspx Life Insurance Life.aspx Retirement Retirement.aspx Dental Dental.aspx Dentists Doctors Doctors.aspx Doctors Logon Page Login.aspx Registration Register.aspx Coho Winery Prospectus Prospectus.aspx XML Web Service dentalService1.asmx Page Header Header.ascx ASPState tempdb Lab Web Application User Control namedate.ascx Menu Component Class1.vb or Class1.cs XML Files Web. config

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